AUSTIN, Texas (AP) — Documents show the $100,000 donation that Texas Attorney General Ken Paxton accepted from the head of a company his office was investigating came despite internal agency rules that prohibit such gifts.

Ethics and legal experts say the donation, which came to light this week, isn't a clear violation of Texas' loose ethics laws.

But internal agency rules obtained by The Associated Press say attorney general's office employees "shall never" take gifts from an entity "the employee knows is being investigated."

Paxton's spokesman says Paxton didn't violate the policy. Paxton is using the money toward his defense on felony securities fraud charges. The Republican has pleaded not guilty.

Paxton's office and federal prosecutors co-signed a June settlement with Preferred Imaging, which was under investigation for Medicaid fraud. Company founder James Webb gave Paxton the money for his legal defense last year.